diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index e672869..eb7ad29 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -21,6 +21,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Java
         uses: actions/setup-java@v4
diff --git a/.gitea/workflows/release.yaml b/.gitea/workflows/release.yaml
index 2ea0bc3..0fef70f 100644
--- a/.gitea/workflows/release.yaml
+++ b/.gitea/workflows/release.yaml
@@ -15,6 +15,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Java
         uses: actions/setup-java@v4
@@ -73,6 +75,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Java
         uses: actions/setup-java@v4
@@ -322,6 +326,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Extract changelog section for this tag
         run: |
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index a142ec1..84b2285 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -120,6 +120,8 @@ dependencies {
 
     implementation(libs.kotlinx.datetime)
     implementation(libs.kotlinx.coroutines.core)
+    implementation("de.jeanlucmakiola.floret:core-time")
+    implementation("de.jeanlucmakiola.floret:core-crash")
 
     debugImplementation(libs.androidx.ui.tooling)
     debugImplementation(libs.androidx.ui.test.manifest)
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index ca41302..6d37b60 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -52,6 +52,14 @@
             </intent-filter>
         </activity>
 
+        <!-- Standalone crash-report surface; MainActivity routes here on a
+             startup crash-loop. Not exported, kept out of recents. -->
+        <activity
+            android:name=".ui.crash.CrashReportActivity"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            android:launchMode="singleTask" />
+
         <!-- Reminder alarm fires here (internal PendingIntent → not exported). -->
         <receiver
             android:name=".data.reminders.DueReminderReceiver"
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/AgendulaApp.kt b/app/src/main/java/de/jeanlucmakiola/agendula/AgendulaApp.kt
index d63d1e9..000182b 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/AgendulaApp.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/AgendulaApp.kt
@@ -7,6 +7,8 @@ import dagger.hilt.android.EntryPointAccessors
 import dagger.hilt.android.HiltAndroidApp
 import dagger.hilt.components.SingletonComponent
 import de.jeanlucmakiola.agendula.data.reminders.ReminderScheduler
+import de.jeanlucmakiola.floret.crash.CrashConfig
+import de.jeanlucmakiola.floret.crash.CrashReporter
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -22,6 +24,17 @@ class AgendulaApp : Application() {
 
     override fun onCreate() {
         super.onCreate()
+        // Install first thing so startup crashes are captured too (privacy-
+        // respecting, on-device; the user submits the report by hand).
+        CrashReporter.install(
+            this,
+            CrashConfig(
+                appLabel = getString(R.string.app_name),
+                newIssueUrl = getString(R.string.report_issue_url),
+                chooseIssueUrl = getString(R.string.report_issue_url),
+                issueTitle = getString(R.string.crash_report_issue_title),
+            ),
+        )
         val scheduler = EntryPointAccessors
             .fromApplication(this, ReminderEntryPoint::class.java)
             .reminderScheduler()
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/MainActivity.kt b/app/src/main/java/de/jeanlucmakiola/agendula/MainActivity.kt
index 053d3a2..0d18703 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/MainActivity.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/MainActivity.kt
@@ -9,6 +9,8 @@ import androidx.activity.enableEdgeToEdge
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -17,8 +19,12 @@ import dagger.hilt.android.AndroidEntryPoint
 import de.jeanlucmakiola.agendula.data.demo.DemoSeeder
 import de.jeanlucmakiola.agendula.data.prefs.ThemeMode
 import de.jeanlucmakiola.agendula.ui.RootScreen
+import de.jeanlucmakiola.agendula.ui.crash.CrashReportActivity
 import de.jeanlucmakiola.agendula.ui.settings.SettingsViewModel
 import de.jeanlucmakiola.agendula.ui.theme.AgendulaTheme
+import de.jeanlucmakiola.floret.crash.CrashReportDialog
+import de.jeanlucmakiola.floret.crash.CrashReporter
+import de.jeanlucmakiola.floret.crash.submitCrashReport
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -32,10 +38,28 @@ class MainActivity : ComponentActivity() {
 
     @Inject lateinit var demoSeeder: DemoSeeder
 
+    // A captured crash report awaiting the user's decision, surfaced as a dialog
+    // over the app on the next launch (the single-crash path). A startup
+    // crash-loop is handled out of band, before setContent — see below.
+    private var pendingCrashReport by mutableStateOf<String?>(null)
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        // If the app keeps crashing as it starts, the main UI can't be trusted
+        // to come up. Route to the standalone report screen instead of
+        // re-entering the crashing graph.
+        if (CrashReporter.isCrashLoop(this)) {
+            startActivity(Intent(this, CrashReportActivity::class.java))
+            finish()
+            return
+        }
+
         enableEdgeToEdge()
 
+        // Surface a single captured crash as a dialog on the next launch.
+        if (CrashReporter.shouldPrompt(this)) pendingCrashReport = CrashReporter.pendingReport(this)
+
         // Debug-only sample data: `am start ... --ez agendula_seed true`. Seeds a
         // local (non-syncing) demo list once; no-op without the extra.
         if (BuildConfig.DEBUG && intent.getBooleanExtra(EXTRA_SEED, false)) {
@@ -51,10 +75,31 @@ class MainActivity : ComponentActivity() {
             }
             AgendulaTheme(darkTheme = darkTheme, dynamicColor = ui.settings.dynamicColor) {
                 RootScreen(modifier = Modifier.fillMaxSize())
+                pendingCrashReport?.let { report ->
+                    CrashReportDialog(
+                        report = report,
+                        onSend = {
+                            submitCrashReport(this@MainActivity, report)
+                            CrashReporter.clearReport(this@MainActivity)
+                            pendingCrashReport = null
+                        },
+                        onDismiss = {
+                            CrashReporter.dismissPrompt(this@MainActivity)
+                            pendingCrashReport = null
+                        },
+                    )
+                }
             }
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        // A successful start breaks any loop; reset the timing trail so a later
+        // ordinary crash isn't mistaken for a loop.
+        CrashReporter.markHealthy(this)
+    }
+
     companion object {
         const val EXTRA_TASK_ID = "de.jeanlucmakiola.agendula.extra.TASK_ID"
         private const val EXTRA_SEED = "agendula_seed"
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/demo/DemoSeeder.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/demo/DemoSeeder.kt
index a97ec03..f3234ff 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/demo/DemoSeeder.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/demo/DemoSeeder.kt
@@ -2,7 +2,7 @@ package de.jeanlucmakiola.agendula.data.demo
 
 import de.jeanlucmakiola.agendula.data.di.IoDispatcher
 import de.jeanlucmakiola.agendula.data.tasks.TasksRepository
-import de.jeanlucmakiola.agendula.domain.DayWindow
+import de.jeanlucmakiola.floret.time.DayWindow
 import de.jeanlucmakiola.agendula.domain.Priority
 import de.jeanlucmakiola.agendula.domain.TaskForm
 import kotlinx.coroutines.CoroutineDispatcher
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
index 0cc8aa5..4a4f80a 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
@@ -1,7 +1,7 @@
 package de.jeanlucmakiola.agendula.data.tasks
 
 import de.jeanlucmakiola.agendula.data.di.IoDispatcher
-import de.jeanlucmakiola.agendula.domain.DayWindow
+import de.jeanlucmakiola.floret.time.DayWindow
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskDetail
 import de.jeanlucmakiola.agendula.domain.TaskFilter
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/DateTimeField.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/DateTimeField.kt
index cfb6a1e..493f41f 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/DateTimeField.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/DateTimeField.kt
@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.agendula.ui.common
 
+import de.jeanlucmakiola.floret.time.formatDateTime
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/crash/CrashReportActivity.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/crash/CrashReportActivity.kt
new file mode 100644
index 0000000..eb67637
--- /dev/null
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/crash/CrashReportActivity.kt
@@ -0,0 +1,61 @@
+package de.jeanlucmakiola.agendula.ui.crash
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.ui.Modifier
+import de.jeanlucmakiola.agendula.ui.theme.AgendulaTheme
+import de.jeanlucmakiola.floret.crash.CrashReportDialog
+import de.jeanlucmakiola.floret.crash.CrashReporter
+import de.jeanlucmakiola.floret.crash.submitCrashReport
+
+/**
+ * Standalone surface for a captured crash report. [MainActivity] routes here
+ * when it detects a startup crash-loop (see [CrashReporter.isCrashLoop]): the
+ * main UI can't be trusted to start, so this screen stays clear of the app's
+ * Hilt graph, DataStore-backed theme and Compose content — it only reads the
+ * report file and shows the kit's report dialog. Plain [AgendulaTheme] defaults
+ * (follow-system, dynamic colour) avoid touching anything that might be the
+ * cause of the crash. The reusable machinery lives in floret-kit's core-crash.
+ */
+class CrashReportActivity : ComponentActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val report = CrashReporter.pendingReport(this)
+        if (report == null) {
+            finish()
+            return
+        }
+        enableEdgeToEdge()
+        setContent {
+            AgendulaTheme {
+                // Opaque backdrop so the dialog doesn't float over a bare task.
+                Surface(Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.surface) {}
+                CrashReportDialog(
+                    report = report,
+                    onSend = {
+                        submitCrashReport(this, report)
+                        CrashReporter.clearReport(this)
+                        finish()
+                    },
+                    onDismiss = {
+                        CrashReporter.clearReport(this)
+                        finish()
+                    },
+                )
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        // Reaching this screen breaks the loop; reset the timing trail so a
+        // later ordinary crash isn't mistaken for a loop.
+        CrashReporter.markHealthy(this)
+    }
+}
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
index ae5c97f..7cf3a8f 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
@@ -72,8 +72,8 @@ import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskDetail
 import de.jeanlucmakiola.agendula.ui.common.GroupedSurface
 import de.jeanlucmakiola.agendula.ui.common.PriorityChip
-import de.jeanlucmakiola.agendula.ui.common.formatDate
-import de.jeanlucmakiola.agendula.ui.common.formatTime
+import de.jeanlucmakiola.floret.time.formatDate
+import de.jeanlucmakiola.floret.time.formatTime
 import de.jeanlucmakiola.agendula.ui.common.pastelize
 import de.jeanlucmakiola.agendula.ui.common.positionOf
 import de.jeanlucmakiola.agendula.ui.tasklist.priorityLabel
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
index 7afa13a..03730db 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
@@ -86,7 +86,7 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.agendula.R
-import de.jeanlucmakiola.agendula.domain.DayWindow
+import de.jeanlucmakiola.floret.time.DayWindow
 import de.jeanlucmakiola.agendula.domain.Priority
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFormError
@@ -98,8 +98,8 @@ import de.jeanlucmakiola.agendula.ui.common.GroupedRow
 import de.jeanlucmakiola.agendula.ui.common.InlineTextField
 import de.jeanlucmakiola.agendula.ui.common.OptionCard
 import de.jeanlucmakiola.agendula.ui.common.priorityFill
-import de.jeanlucmakiola.agendula.ui.common.formatDate
-import de.jeanlucmakiola.agendula.ui.common.formatTime
+import de.jeanlucmakiola.floret.time.formatDate
+import de.jeanlucmakiola.floret.time.formatTime
 import de.jeanlucmakiola.agendula.ui.common.localToInstant
 import de.jeanlucmakiola.agendula.ui.common.pastelize
 import de.jeanlucmakiola.agendula.ui.common.positionOf
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
index 5af32fd..9fc2786 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
@@ -4,7 +4,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.agendula.data.tasks.TasksRepository
-import de.jeanlucmakiola.agendula.domain.DayWindow
+import de.jeanlucmakiola.floret.time.DayWindow
 import de.jeanlucmakiola.agendula.domain.SmartList
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFilter
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
index 9ccf40d..e2a7016 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
@@ -81,7 +81,7 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.agendula.R
-import de.jeanlucmakiola.agendula.domain.DayWindow
+import de.jeanlucmakiola.floret.time.DayWindow
 import de.jeanlucmakiola.agendula.domain.Priority
 import de.jeanlucmakiola.agendula.domain.SmartList
 import de.jeanlucmakiola.agendula.domain.Task
@@ -91,7 +91,7 @@ import de.jeanlucmakiola.agendula.domain.TaskSections
 import de.jeanlucmakiola.agendula.ui.common.ListNameChip
 import de.jeanlucmakiola.agendula.ui.common.Position
 import de.jeanlucmakiola.agendula.ui.common.PriorityChip
-import de.jeanlucmakiola.agendula.ui.common.formatDateTime
+import de.jeanlucmakiola.floret.time.formatDateTime
 import de.jeanlucmakiola.agendula.ui.common.pastelize
 import de.jeanlucmakiola.agendula.ui.common.positionOf
 import java.time.ZoneId
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6f54d66..6e4f52d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -176,6 +176,7 @@
     <string name="settings_report_problem">Report a problem</string>
     <string name="settings_report_problem_hint">Open the issue tracker</string>
     <string name="about_source_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/agendula</string>
+    <string name="crash_report_issue_title">Crash report</string>
     <string name="report_issue_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/agendula/issues/new</string>
     <string name="about_license_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/agendula/src/branch/main/LICENSE</string>
     <string name="about_support_url" translatable="false">https://ko-fi.com/jeanlucmakiola</string>
diff --git a/floret-kit b/floret-kit
index d3ae83f..19c2f8a 160000
--- a/floret-kit
+++ b/floret-kit
@@ -1 +1 @@
-Subproject commit d3ae83f1a49ebe8f5e5e5ae65894e78e0f93c08b
+Subproject commit 19c2f8a6778ba1971c56be4248dc6f6ac98f7dec
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 7b570ed..da21983 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -25,3 +25,4 @@ dependencyResolutionManagement {
 
 rootProject.name = "Agendula"
 include(":app")
+includeBuild("floret-kit")